X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Ffd-stream.lisp;h=b403ffad183e2124e9eea0e7f9e42b89ea37d153;hb=4ed3f0d08c3a57a6762018d9622f253ab9d0f2b6;hp=95b7ce215481f7c62a61dbb6b75180a3421a016f;hpb=02abc70f6d8d522d0b1b94a5eababda9409d1e53;p=sbcl.git

diff --git a/src/code/fd-stream.lisp b/src/code/fd-stream.lisp
index 95b7ce2..b403ffa 100644
--- a/src/code/fd-stream.lisp
+++ b/src/code/fd-stream.lisp
@@ -591,12 +591,28 @@
 ;;; Note that this blocks in UNIX-READ. It is generally used where
 ;;; there is a definite amount of reading to be done, so blocking
 ;;; isn't too problematical.
-(defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p)
+(defun fd-stream-read-n-bytes (stream buffer start requested eof-error-p
+			       &aux (total-copied 0))
   (declare (type file-stream stream))
-  (declare (type index start requested))
-  (do ((total-copied 0))
+  (declare (type index start requested total-copied))
+  (let ((unread (fd-stream-unread stream)))
+    (when unread
+      ;; AVERs designed to fail when we have more complicated
+      ;; character representations.
+      (aver (typep unread 'base-char))
+      (aver (= (fd-stream-element-size stream) 1))
+      ;; KLUDGE: this is a slightly-unrolled-and-inlined version of
+      ;; %BYTE-BLT
+      (etypecase buffer
+	(system-area-pointer
+	 (setf (sap-ref-8 buffer start) (char-code unread)))
+	((simple-unboxed-array (*))
+	 (setf (aref buffer start) unread)))
+      (setf (fd-stream-unread stream) nil)
+      (setf (fd-stream-listen stream) nil)
+      (incf total-copied)))
+  (do ()
       (nil)
-    (declare (type index total-copied))
     (let* ((remaining-request (- requested total-copied))
 	   (head (fd-stream-ibuf-head stream))
 	   (tail (fd-stream-ibuf-tail stream))
@@ -855,7 +871,6 @@
     (:element-type
      (fd-stream-element-type fd-stream))
     (:interactive-p
-      ;; FIXME: sb!unix:unix-isatty is undefined.
      (= 1 (the (member 0 1)
             (sb!unix:unix-isatty (fd-stream-fd fd-stream)))))
     (:line-length
@@ -1210,7 +1225,7 @@
 		      (open-error "~@<The path ~2I~_~S ~I~_does not exist.~:>"
 				  pathname))
 		     (t nil)))
-		  ((and (eql errno sb!unix:eexist) if-exists)
+		  ((and (eql errno sb!unix:eexist) (null if-exists))
 		   nil)
 		  (t
 		   (vanilla-open-error)))))))))